CN102222246A - Carrier inhibiting method for radio frequency identification reader-writer and radio frequency device - Google Patents
Carrier inhibiting method for radio frequency identification reader-writer and radio frequency device Download PDFInfo
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Abstract
The invention relates to a carrier inhibiting method for a radio frequency identification reader-writer, which comprises the following steps of: processing a received signal to obtain two paths of orthogonal baseband signals, obtaining an initial phase valve and an amplitude valve of a cancelling signal by use of two paths of orthogonal baseband signals; carrying out iterative operation on the initial phase value of the cancelling signal to obtain a target phase valve of the cancelling signal; and generating the cancelling signal, and overlapping the cancelling signal to the received signal after modulation. The invention also relates to a radio frequency device of the radio frequency identification reader-writer. By implementing the carrier inhibiting method for the radio frequency identification reader-writer and the radio frequency device in the invention, the beneficial effect that the carrier of the reader-writer per se in a receiving channel can be effectively cancelled is achieved.
Description
Technical field
The present invention relates to field of radio frequency identification, more particularly, relate to a kind of carrier suppressed method and radio-frequency unit of radio-frequency identification reader/writer.
Background technology
Radio-frequency (RF) identification is a kind of recognition technology of utilizing the spatial transmission electromagnetic wave to carry out exchanges data.Radio-frequency recognition system mainly is made up of reader and label.Reader obtains information by identification label.According to the difference of tag class, decipherment distance is also different.Existing label is divided into two kinds of active label and passive labels.Wherein passive label is because cost is low and volume is used widely for a short time.But communicate because passive label is a carrier wave by the reflection modulation read write line, thereby be subjected to many interference easily, these interference comprise: the transmission signal of read write line, it is a phase noise for reception carrier, easily and echo obscure; The non-tag reflection carrier wave that read write line receives; The leakage carrier wave of read write line inside.These interference all are the same audio-frequency noise that has out of phase with read write line self carrier wave for read write line.If these noises directly amplify after entering receiving cable, will surpass the dynamic range of receiver, make receiving cable get clogged, can't correctly solve echo information.Therefore, elimination as much as possible or counteracting read write line self carrier signal are the comparatively key measures that reaches peak response; But, when receiving, comparatively effectively do not eliminate or offset the method for read write line self carrier wave in the prior art.
Summary of the invention
The technical problem to be solved in the present invention is, the above-mentioned method defective of comparatively effectively not eliminating or offset read write line self carrier wave when receiving at prior art provides a kind of method and the radio-frequency unit that can offset read write line self carrier wave largely.
The technical solution adopted for the present invention to solve the technical problems is: construct a kind of carrier suppressed method of radio-frequency identification reader/writer, comprise the steps:
A) handle to the received signal, obtain the baseband signal of two-way quadrature;
B) utilize the baseband signal of described two-way quadrature to obtain the prima facies place value and the range value of offseting signal;
C) the prima facies place value of described offseting signal is carried out interative computation, obtain the target phase value of described offseting signal;
D) generate offseting signal, and with it on the described signal that receives that is added to after the ovennodulation.
In the carrier suppressed method of a kind of radio-frequency identification reader/writer of the present invention, described steps A) further comprise the steps:
A1) the described signal that receives is amplified in advance, and carry out quadrature demodulation, obtain two-way quadrature intermediate-freuqncy signal;
A2) two-way quadrature intermediate-freuqncy signal is carried out low-pass filtering and analog to digital conversion respectively, obtain the baseband signal of two-way quadrature.
In the carrier suppressed method of a kind of radio-frequency identification reader/writer of the present invention, described step B) further comprise the steps:
B1) according to formula
Obtain the initial amplitude of offseting signal;
B2) according to formula
Obtain the initial phase of offseting signal;
Wherein, A is the initial amplitude value of described offseting signal,
Be the prima facies place value of described offseting signal, S
QBe one range value in the baseband signal of described two quadratures, S
IIt is another range value in the baseband signal of described two quadratures.
In the carrier suppressed method of a kind of radio-frequency identification reader/writer of the present invention, described step C) further comprise the steps:
C1) on the basis of the prima facies place value of the offseting signal that obtains respectively to its increase with reduce a skew phase value θ who sets, the phase value that is increased and reduce;
C2) utilize the phase value of the phase value of described initial amplitude and increase, described initial amplitude and minimizing to obtain the first iteration offseting signal and secondary iteration offseting signal respectively;
C3) respectively with the modulation of the described first iteration offseting signal and secondary iteration offseting signal and the described input signal that is added to, and when recording described first iteration offseting signal of stack and secondary iteration offseting signal respectively near the power the local frequency and;
C4) more described power and size, and according to the direction of phase adjustment of power and less iteration offseting signal with described initial phase
With the pi/2 that adds deduct
iStep-length regulate; Wherein, i is an iterations;
C5) finish iteration? in this way, withdraw from interative computation, with the target phase value of the phase value after regulating as described offseting signal
Otherwise, with the phase value after the described adjusting
Or
As initial phase, return step C1).
In the carrier suppressed method of a kind of radio-frequency identification reader/writer of the present invention, described step C5) in, the condition of finishing iteration be finish prior setting or by the interative computation number of times of host computer regulation.
In the carrier suppressed method of a kind of radio-frequency identification reader/writer of the present invention, described step D) further comprise the steps:
D1) generate offseting signal according to initial amplitude value that obtains and prima facies place value, described offseting signal is the baseband signal of two quadratures, is respectively
And
D2) baseband signal of described two quadratures that obtain is carried out orthogonal modulation, obtain offseting signal
The present invention has also disclosed a kind of radio-frequency unit of realizing the carrier suppressed method of above-mentioned radio-frequency (RF) Reader, comprise the sendaisle and the receiving cable that link together by loop coupling device, described receiving cable comprises that the conversion of signals that is used for receiving is the digital orthogonal baseband signal formation module of two base band orthogonal signal, the data decode module of tag transmits data will be obtained in the described digital orthogonal baseband signal output signal, obtain module by the initial amplitude value that obtains offseting signal in the described digital orthogonal baseband signal output signal and the initial parameter of prima facies place value, described initial parameter is obtained that prima facies place value in the module output is carried out iteration and the target phase value that obtains the target phase value obtains module, utilize described initial amplitude value and target phase value generate quadrature the base band offseting signal the offseting signal generation module and the base band offseting signal of described quadrature is modulated to offseting signal and outputs to the offseting signal modulation module of merging into the signal that receives in the combiner with described receiving cable input signal.
In radio-frequency unit of the present invention, described initial parameter obtains module and further comprises two base band orthogonal signal accepting the described conversion of signals one-tenth that receives, and according to
The initial amplitude that obtains the offseting signal initial amplitude obtain the unit and according to
The initial phase that obtains the offseting signal initial phase is obtained the unit; Wherein A is the initial amplitude value of described offseting signal,
Be the prima facies place value of described offseting signal, S
QBe one range value in the baseband signal of described two quadratures, S
IIt is another range value in the baseband signal of described two quadratures.
In radio-frequency unit of the present invention, described target phase value obtains module and comprises the skew phase unit that is used for increasing or deducting the skew phase value θ of setting on described prima facies place value, is that its phase place of initial amplitude is respectively to its amplitude respectively
With
The first iteration offseting signal and secondary iteration offseting signal modulation the back power and the comparing unit that mix near the back power the local frequency of described radio-frequency unit with the receiving cable input signal and compare, according to pi/2
iStep-length regulate the initial phase fine-adjusting unit of described initial phase and calculate iterations and judge the iteration judging unit whether iteration is finished, wherein i is an iterations.
In radio-frequency unit of the present invention, described digital orthogonal baseband signal forms the first quadrature local oscillations source and the second quadrature local oscillations source that module and described offseting signal modulation module comprise the local oscillated signal of output orthogonal respectively, and the oscillator signal in described first, second quadrature local oscillations source is by the local oscillation signal coupling of described sendaisle and get.
Implement the carrier suppressed method and the radio-frequency unit of radio-frequency identification reader/writer of the present invention, has following beneficial effect: owing to be the baseband signal of quadrature with the signal decomposition that receives, and initial amplitude and prima facies place value from wherein obtaining offseting signal, again the prima facies place value is adjusted, obtained the target phase value; Form offseting signal according to initial amplitude and target phase value again, offset the carrier signal in the receiving cable.Therefore, can more efficiently offset read write line self carrier wave in the receiving cable.
Description of drawings
Fig. 1 is the process flow diagram of method among the carrier suppressed method of radio-frequency identification reader/writer of the present invention and the radio-frequency unit embodiment;
Fig. 2 is the process flow diagram of described embodiment initial phase interative computation;
Fig. 3 is the structural representation of radio-frequency unit among the described embodiment.
Embodiment
Embodiments of the present invention is further illustrated below in conjunction with accompanying drawing.
As shown in Figure 1, in the carrier suppressed method and radio-frequency unit embodiment of radio-frequency identification reader/writer of the present invention, its carrier suppressed scheme comprises the steps:
Step S11 amplifies to the received signal in advance, rectification, obtain two-way quadrature intermediate-freuqncy signal: in this step, the signal that enters receiving cable by antenna, circulator passes through combiner, and through being divided into two-way behind pre-the amplification, adopt the local oscillation signal rectification of its phase phasic difference 90 degree respectively, obtain the intermediate-freuqncy signal of two-way quadrature.During beginning, also there is not offseting signal output on another input end of combiner.If another input end has offseting signal input in the combiner, so, in this step, processing be exactly by combiner superpose mixed input signal and offseting signal, the signal that promptly receives.In the present embodiment, above-mentioned local oscillation signal is by the local oscillation signal of the quadrature that obtains after the phase place adjustment is carried out to it in the local oscillator coupling back that sends.
Step S12 to the filtering of two-way quadrature intermediate-freuqncy signal, analog to digital conversion, obtains digital orthogonal baseband signal respectively: in this step, respectively the two-way intermediate-freuqncy signal that obtains in the top step is carried out low pass filtered and involve analog to digital conversion, obtain the baseband signal of two-way quadrature.Described baseband signal is digital signal.
Step S13 obtains the initial amplitude value: in this step, and according to formula
Obtain the initial amplitude of offseting signal;
Step S14 obtains the prima facies place value: in this step, and according to formula
Obtain the initial phase of offseting signal; In this step and step S13, A is the initial amplitude value of described offseting signal,
Be the prima facies place value of described offseting signal, S
QBe one range value in the baseband signal of described two quadratures, S
IIt is another range value in the baseband signal of described two quadratures.
Step S15 obtains the target phase value to prima facies place value iteration: in this step, the prima facies place value that obtains among the step S14 is carried out iteration, obtain the target phase value
Its detailed process describes in detail after a while.
Step S16 obtains two-way base band offseting signal according to initial amplitude value and target phase value: in this step, generate two-way base band offseting signal according to initial amplitude value that obtains in the above-mentioned steps and target phase value, be respectively
And
Step S17 orthogonal modulation two-way base band offseting signal, obtain offseting signal and mix back with received signal: in this step as the signal that receives, respectively the baseband signal of two quadratures obtaining is carried out digital-to-analog conversion, and by the local oscillation signal of phase phasic difference 90 degree it is carried out orthogonal modulation respectively, obtain offseting signal
This signal and the identical width of cloth of received signal approximate reverse that mixes the leakage carrier wave feed back to receiving cable with it by combiner, can reach to eliminate the carrier wave leakage effects of jamming.In the present embodiment, above-mentioned local oscillation signal is by the local oscillation signal of the quadrature that obtains after the phase place adjustment is carried out to it in the local oscillator coupling back that sends.
In above-mentioned steps, step S11, S12 obtain the baseband signal of two-way quadrature for handling to the received signal; Step S13, S14 utilize the baseband signal of described two-way quadrature to obtain the prima facies place value and the range value of offseting signal; Step S15 obtains the target phase value of described offseting signal for the prima facies place value of described offseting signal is carried out interative computation; Step S16, S17 are the generation offseting signal, and with its signal to obtain receiving on the received signal that is added to after the ovennodulation.
In the present embodiment, above-describedly initial phase is adjusted into the target phase value by iteration
Step see shown in Figure 2ly, its step is as follows:
Step S301 decides the iteration initial phase, and this phase place is a step S14 gained initial phase
Step S302 and step S304 add and subtract the skew phase place respectively, for generating two comparative quantities, in phase place
Last plus-minus θ obtains two paths of signals.That is to say, on the basis of the prima facies place value of the offseting signal that in step S302, step S304, is obtaining respectively to its increase with reduce a skew phase value θ who sets, the phase value that is increased and reduce; Utilize the phase value of phase value, initial amplitude and the minimizing of initial amplitude and increase to obtain the first iteration offseting signal and secondary iteration offseting signal respectively; What deserves to be mentioned is that two comparative quantities in step S302 and step S304 are not produced simultaneously, but successively produce, for example, the phase value that can produce an increase is earlier measured as a comparison, with its output, and by step S303 obtain the power corresponding with this comparative quantity and; Produce one again and reduce phase value as the another one comparative quantity, by step S305 obtain another one comparative quantity correspondence power and; Execution in step S306 more afterwards.Though the setting of this comparative quantity and power and acquisition mode are sacrificed on timeliness to some extent,, the structure of its power and Acquisition Circuit is relative simple, and cost is lower.That is to say that step S302 and step S303 are one the tunnel; Step S304 and step S305 are other one the tunnel, and this two-way is not to carry out simultaneously, but successively carry out.
Step S303 and step S305 bring into respectively offset and calculate corresponding power and, two paths of signals is fed back in the received signal, gather near the local frequency power and.In this step, respectively with the modulation of the first iteration offseting signal and secondary iteration offseting signal and the described input signal that is added to, and when recording stack first iteration offseting signal and secondary iteration offseting signal respectively near the power the local frequency and.
Step S306 relatively two power and, and according to the direction of phase adjustment of power and less iteration offseting signal with described initial phase
With the pi/2 that adds deduct
iStep-length regulate; Wherein, i is an iterations;
Step S307 and step S308 produce the iteration phase place respectively, select iteration direction to carry out next iteration according to comparative result.In step S307 and step S308, in an iterative process, only can carry out in these two steps, the step that is performed is according to above-mentioned power and comparative result decision; If power and 1 is less than power and 2 (seeing also Fig. 2), then execution in step S307; Otherwise execution in step S308.In these two steps, also need to judge whether to finish iteration respectively? in this way, withdraw from interative computation, with the target phase value of the phase value after regulating as described offseting signal
Otherwise, with the phase value after the described adjusting
Or
As initial phase, begin iteration once more.
The result that above-mentioned steps S301-S308 carries out is to obtain a comparatively accurate target phase place, eliminates the carrier wave in the received signal better.
In addition, in the present embodiment, also relate to a kind of radio-frequency unit of realizing above-mentioned carrier suppressed method, the structure of this radio-frequency unit as shown in Figure 3, comprise: antenna 101, circulator 102, combiner 103, power amplifier 104, low noise amplifier 105, variable gain amplifier 106, multiplier 107, directional coupler 108, phase-splitter 109, digital to analog converter 110, local oscillator 111, low-pass filter 112, analog to digital converter 113, send signaling module 114, data decode module 115, initial parameter obtains module 116, target phase obtains module 117, offseting signal forms module 118 and received power detection module 119.Wherein, power amplifier 104, multiplier 107, digital to analog converter 110, transmission signaling module 114 and local oscillator 111 constitute sendaisles; Miscellaneous part except that antenna 101 and circulator 102 is a receiving cable, and referring to Fig. 3, wherein being connected the part that data decode module 115, initial parameter obtain between module 116 and the low noise amplifier 105 is that digital orthogonal baseband signal forms module; The part that is connected between offseting signal formation module 118 and the variable gain amplifier 106 is the offseting signal modulation module; Digital orthogonal baseband signal forms module the signal (comprising independent received signal and the received signal of having mixed offseting signal) that receives is converted to two base band orthogonal signal; Data decode module 115 is formed by described digital orthogonal baseband signal and obtains the tag transmits data in the module output signal; Initial parameter obtains module 116 and is formed initial amplitude value and the prima facies place value that obtains offseting signal in the module output signal by described digital orthogonal baseband signal; The target phase value obtains the prima facies place value that 117 pairs of initial parameters of module obtain in module 116 output and carries out iteration and obtain the target phase value; Offseting signal generation module 118 utilizes initial amplitude value and target phase value (being adjusted prima facies place value in above-mentioned iterative process) to generate the base band offseting signal of quadrature; The offseting signal modulation module is modulated to the base band offseting signal of quadrature offseting signal and outputs in the combiner 103 merges into the signal that receives with above-mentioned receiving cable input signal; Near power and the information of received signal intermediate frequency that received power detection module 119 will mix offseting signal outputs to the foundation that the target phase value obtains module 117 conduct judgement iteration travel directions.
In the present embodiment, initial parameter obtains module 116 and comprises that further the initial amplitude value obtains the unit and the prima facies place value obtains the unit (not shown); Wherein, initial amplitude obtains the unit described digital orthogonal baseband signal is formed two base band orthogonal signal that module converts becomes, according to
Obtain the offseting signal initial amplitude; Initial phase obtain the unit according to
Obtain the offseting signal initial phase; Wherein A is the initial amplitude value of offseting signal,
Be the prima facies place value of offseting signal, S
QBe one range value in the baseband signal of two quadratures, S
IIt is another range value in the baseband signal of two quadratures.And the target phase value obtain module 117 comprise the skew phase unit, power and comparing unit, initial phase fine-adjusting unit and iteration judging unit (not shown); Wherein, the skew phase unit is used for increasing or deducting the skew phase value θ of setting on described prima facies place value; Power and comparing unit are that its phase place of initial amplitude is respectively in its amplitude
With
The first iteration offseting signal and the secondary iteration offseting signal after modulating with after the receiving cable input signal mixes, respectively through received power detection module 119 obtain near the local frequency of described radio-frequency unit power and, and both are compared; The initial phase fine-adjusting unit is according to pi/2
iStep-length regulate initial phase, wherein i is an iterations; The iteration judging unit calculates iterations and judges whether iteration is finished; In the present embodiment, iterations i imports by the host computer of artificial or this reader in advance.
Wherein, send signaling module 114, data decode module 115, initial parameter obtain module 116, and target phase obtains module 117 and offseting signal formation module 118 belongs to the digital signal processing parts, and remaining part is an analog signal processing component.
In the present embodiment, signal flow is as follows: at first, send signaling module 114 baseband signal is sent into digital to analog converter 110, digital signal is converted to simulating signal, send into multiplier 107, after the carrier signal modulation that local oscillator 111 sends, send into power amplifier 104, send into circulator 102 and antenna 101 emissions after the amplification.
Received signal enters receiving cable by antenna 101 and circulator 102, at first pass through combiner 103, send into quadrature demodulation passage I after amplifying through low noise amplifier 105 then, among the Q (being that above-mentioned digital orthogonal baseband signal forms in the module), wherein 0 ° of phase-shift signal of I road signal and local oscillator 111 multiplies each other, demodulation behind low-pass filter 112 is sent into and is converted digital signal in the analog to digital converter 113 to and enter data decode module 115; 90 ° of phase-shift signals of Q road signal and local oscillator 111 multiply each other, and remainder is with the I road.
Because antenna of received signal and transmission signal common, and separate through circulator, the isolation of circulator has determined to be mixed with in the received signal leakage carrier wave, thereby this device has designed carrier cancellation loop, described carrier cancellation loop comprises: the signal after the digitizing through initial parameter obtain module 116 calculate offset phase place and amplitude after, sending into the target phase value obtains module 117 and carries out phase place and further approach, send into the offseting signal modulation module then, after digital-to-analog conversion and orthogonal modulation, send into variable gain amplifier 106 and carry out the amplitude correction, generate carrier cancelled signal at last and send into combiner 103.
The above embodiment has only expressed several embodiment of the present invention, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to claim of the present invention.Should be pointed out that for the person of ordinary skill of the art without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.
Claims (10)
1. the carrier suppressed method of a radio-frequency identification reader/writer is characterized in that, comprises the steps:
A) handle to the received signal, obtain the baseband signal of two-way quadrature;
B) utilize the baseband signal of described two-way quadrature to obtain the prima facies place value and the range value of offseting signal;
C) the prima facies place value of described offseting signal is carried out interative computation, obtain the target phase value of described offseting signal;
D) generate offseting signal, and with it on the described signal that receives that is added to after the ovennodulation.
2. the carrier suppressed method of radio-frequency identification reader/writer according to claim 1 is characterized in that, described steps A) further comprise the steps:
A1) the described signal that receives is amplified in advance, and carry out quadrature demodulation, obtain two-way quadrature intermediate-freuqncy signal;
A2) two-way quadrature intermediate-freuqncy signal is carried out low-pass filtering and analog to digital conversion respectively, obtain the baseband signal of two-way quadrature.
3. the carrier suppressed method of radio-frequency identification reader/writer according to claim 2 is characterized in that, described step B) further comprise the steps:
B1) according to formula
Obtain the initial amplitude of offseting signal;
B2) according to formula
Obtain the initial phase of offseting signal;
Wherein, A is the initial amplitude value of described offseting signal,
Be the prima facies place value of described offseting signal,
Be one range value in the baseband signal of described two quadratures,
It is another range value in the baseband signal of described two quadratures.
4. the carrier suppressed method of radio-frequency identification reader/writer according to claim 3 is characterized in that, described step C) further comprise the steps:
C1) on the basis of the prima facies place value of the offseting signal that obtains respectively to its increase with reduce by a skew phase value of setting
, the phase value that is increased and reduce;
C2) utilize the phase value of the phase value of described initial amplitude and increase, described initial amplitude and minimizing to obtain the first iteration offseting signal and secondary iteration offseting signal respectively;
C3) respectively with the modulation of the described first iteration offseting signal and secondary iteration offseting signal and the described input signal that is added to, and when recording described first iteration offseting signal of stack and secondary iteration offseting signal respectively near the power the local frequency and;
C4) more described power and size, and according to power and the direction that reduces with described initial phase
With the pi/2 that adds deduct
iStep-length regulate; Wherein, i is an iterations;
C5) finish iteration? in this way, withdraw from interative computation, with the target phase value of the phase value after regulating as described offseting signal
Otherwise, with the phase value after the described adjusting
Or
As initial phase, return step C1).
5. the carrier suppressed method of radio-frequency identification reader/writer according to claim 4 is characterized in that, described step C5) in, the condition of finishing iteration be finish prior setting or by the interative computation number of times of host computer regulation.
6. according to the carrier suppressed method of the described radio-frequency identification reader/writer of claim 1-5, it is characterized in that described step D) further comprise the steps:
D1) generate offseting signal according to initial amplitude value that obtains and prima facies place value, described offseting signal is the baseband signal of two quadratures, is respectively
And
D2) baseband signal of described two quadratures that obtain is carried out orthogonal modulation, obtain offseting signal
7. the radio-frequency unit of a radio-frequency identification reader/writer, comprise the sendaisle and the receiving cable that link together by loop coupling device, it is characterized in that, described receiving cable comprises that the conversion of signals that is used for receiving is the digital orthogonal baseband signal formation module of two base band orthogonal signal, the data decode module of tag transmits data will be obtained in the described digital orthogonal baseband signal output signal, obtain module by the initial amplitude value that obtains offseting signal in the described digital orthogonal baseband signal output signal and the initial parameter of prima facies place value, described initial parameter is obtained that prima facies place value in the module output is carried out iteration and the target phase value that obtains the target phase value obtains module, utilize described initial amplitude value and target phase value generate quadrature the base band offseting signal the offseting signal generation module and the base band offseting signal of described quadrature is modulated to offseting signal and outputs to the offseting signal modulation module of merging into the signal that receives in the combiner with described receiving cable input signal.
8. the radio-frequency unit of radio-frequency identification reader/writer according to claim 7 is characterized in that, described initial parameter obtains module and further comprises two base band orthogonal signal accepting the described conversion of signals one-tenth that receives, and according to
The initial amplitude that obtains the offseting signal initial amplitude obtain the unit and according to
The initial phase that obtains the offseting signal initial phase is obtained the unit; Wherein A is the initial amplitude value of described offseting signal,
Be the prima facies place value of described offseting signal,
Be one range value in the baseband signal of described two quadratures,
It is another range value in the baseband signal of described two quadratures.
9. the radio-frequency unit of radio-frequency identification reader/writer according to claim 8 is characterized in that, described target phase value obtains module and comprises the skew phase value that is used for increasing or deducting setting on described prima facies place value
The skew phase unit, be that its phase place of initial amplitude is respectively to its amplitude respectively
-
With
+
The first iteration offseting signal and secondary iteration offseting signal modulation the back power and the comparing unit that mix near the back power the local frequency of described radio-frequency unit with the receiving cable input signal and compare, according to pi/2
iStep-length regulate the initial phase fine-adjusting unit of described initial phase and calculate iterations and judge the iteration judging unit whether iteration is finished; Wherein i is an iterations.
10. the radio-frequency unit of radio-frequency identification reader/writer according to claim 9, it is characterized in that, described digital orthogonal baseband signal forms the first quadrature local oscillations source and the second quadrature local oscillations source that module and described offseting signal modulation module comprise the local oscillated signal of output orthogonal respectively, and the oscillator signal in described first, second quadrature local oscillations source is by the local oscillation signal coupling of described sendaisle and get.
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| CN110398717A (en) * | 2019-06-21 | 2019-11-01 | 电子科技大学 | Strong noise signal suppressing method and system based on step frequency Through-Wall Radar System |
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| CN110969034A (en) * | 2019-11-04 | 2020-04-07 | 锐捷网络股份有限公司 | Carrier cancellation circuit and RFID reader-writer |
| CN110969034B (en) * | 2019-11-04 | 2022-10-14 | 锐捷网络股份有限公司 | Carrier cancellation circuit and RFID reader-writer |
| CN111310506A (en) * | 2020-05-14 | 2020-06-19 | 北京智芯微电子科技有限公司 | Decoding method and device for RFID reader-writer |
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